fix: missing convert function in attitude widget (#192)

Author: cmotelet

lib/ui/widgets/attitude.js

@@ -1,6 +1,7 @@
 import React from 'react';
 import { render } from 'react-dom';
 import util from 'util';
+import Qty from 'js-quantities'
 
 import BaseWidget, {defaultComponentDidMount, defaultComponentWillUnmount} from './basewidget';
 
@@ -11,6 +12,8 @@ const defaultValue = {
   roll:  defaultText
 }
 
+let convertRadToDeg = Qty.swiftConverter('rad', 'deg')
+
 function Attitude(id, options, streamBundle, instrumentPanel) {
   BaseWidget.call(this, id, options, streamBundle, instrumentPanel);
   class ReactComponent extends React.Component {
@@ -78,7 +81,7 @@ Attitude.prototype.getInitialDimensions = function() {
 
 function convertAndRound(value) {
   return (typeof value === 'number') ?
-  convert(value).toFixed(4) + '°' : defaultText
+  convertRadToDeg(value).toFixed(4) + '°' : defaultText
 }